Keep in mind that Kevlar plays much softer after it's broken in than when it's fresh. I recommend stringing in the low 60s for a midplus or mid 50s for a mid - it might feel too stiff and low powered at first, but it will feel just right after it breaks in. If you go much lower, it might feel mushy after it breaks in. And broken-in 16g Kevlar will plateau and play the same with great bite for months.

While poly goes dead after several hours of play (some say 12 to 15 hours), kevlar seems to "work in" after a session or two and stay there. Too tight may feel much like a brick since the stuff has almost zero resilience, so figure on your first stringing with it to give you a reference. If you're leery about going down to the high 40's, I'd figure on going in the mid 50's to see how it plays out. After that first one, I'd bet that you'll either like it or just need it a little tighter or looser.